Dynamo-electric machine.



No. 893,870. PATENTED JULY 14, 1908. H. H. RALSTON.

DYNAM O ELECTRIC MACHINE.

APPLICATION FILED NOV.29,1905.

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DYNAMO ELECTRIC MACHINE.-

APPLIUATION FILED NOV. 29, 1905.

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1 near the end of the armature.

onii'nn U'LA'LES PATENT OFFICE.

HOWARD H. RALSTON, OF NORWOOD, OHIO, ASSIGNOR TO THE BULLOCK ELECTRICMANU- FACTURING COMPANY, A CORPORATION OF OHIO.

DYNAMO-E LECTRIC MACHINE Application filed November 29, 1905.

To all whom it may concern:

Be it known that I, HOWARD I-I. RALsToN, citizen of the United States,residing at Norwood, in the county of Hamilton and State of Ohio, haveinvented certain new and useful Improvements in Dynamo-ElectricMachines, of which the following is a full, clear, and ex actspecification.

My invention relates to dynamo-electric machines, and particularly tothe supports for the brush forks.

It sometimes happens that the brush supports are not properly locatedrelative to the commutator. For example one or more of the brushsupports may not be properly located circumferentially of thecommutator; that is, the brushes carried thereby may not be on theproper line of commutation, or one or more of the brush supports may betoo As brush riggings are usually constructed there is no provision foradjusting the brush supports separately, and accordingly any mistakes orinaccuracies of workmanship may entail considerable waste in material orresult in sparking at the brushes.

The object of my invention is to provide means whereby each brushsupport can be adjusted so that it will be properly located relative tothe commutator and armature. With this end in view I so mount the brushsupports that each can be adjusted axially or axially and laterally ofthe commutator.

More specifically considered my invention consists in providingadjustable eccentric mountings for the radially extending brush forks ofa dynamo electric machine, whereby each brush support can be shifted toits proper position.

My invention still further consists in certain novel details ofconstruction and combinations of elements described in the s ecificationand set forth in the appended c aims.

For a better understanding of my invention, reference is had to theaccom anying drawings forming a part of this app ication, in whichFigure 1 is a sectional elevation of a portion of a dynamo-electricmachine equi ped with my invention; Fig. 2 is a partial eiiavation ofthe same, parts being broken away for the sake of clearness; Fig. 3 isan elevation of one form of the eccentric support for each of the brushforks; Fi 4 is an end view of the same; Fig. 5 is an e evation of a por-Specification of Letters Patent.

Patented July 14, 1908.

Serial No. 289,566.

tion of a brush fork showing a modification of the adjustable support ormounting therefor; and Fig. 6 is the bottom view of the same.

Referring to the figures of the drawing, I have shown at 10 a shaft of adynamo-electric machine, on which are mounted the armature 11 andcommutator 12. The stationary field frame 13 is provided on the endadjacent the commutator with a groove 14., in which is held the brushyoke. In this case the brush yoke consists of an outer ring 15, an innerring 16, and the connecting arms 17. All the parts so far described arewell known and I claim no novelty therein.

The brush forks are mounted in the inner ring 16, there being as manyforks as field poles. In the usual construction, the posi tions of thebrush forks are not separately adjustable, except in a radial direction.It sometimes happens however, as was stated before, that the brush forksare not properly located. If the brush forks are too near the end of thearmature, the latter may engage the forks as it rotates, and if theholes or openings in the inner ring which receive the brush forksupports are not properly spaced, the brushes of one or more of theforks will not be pro aerly located on the line of commutation, anchence considerable sparking will result. I overcome these difficultiesby providing means for adjusting each fork separately both laterally andaxially of the commutator.

Radial spindles or bolts 18 are mounted in the yoke at proper intervalsto support the brush forks 19. In the preferred form of my invention,the spindles are provided with enlarged eccentric portions 20 on whichthe forks are mounted. The forks are clamped to the eccentric portionsby means of the split collar 21 and bolt 22. Each spindle is provided atits inner end with a squared ortion 23, to which a wrench may be app iedfor adjusting the spindle. The spindles are all carefully insulated fromthe ring in which they are mounted by insulating tubes 24 and insulatingwashers 25. The ordinary cross connectors, for connecting respectively,all the ositive brushes and all the negative brus es are shown at 26.Strap conductors 27 join the spindles to the proper cross connectors 26.

It is seen that by turning any one of the spindles 18, the position ofthe brush fork mounted thereon can be adjusted. If the brushes are noton the proper line of commutation, all that is necessary is to turn thes indle until the brush fork is moved latera ly or tangentially asufficient distance. The fork will also be moved longitudinally of thecommutator, but the longitudinal movement is immaterial, under ordinarycircumstances. If, however, one or more of the brush forks are too nearthe armature and it is desired to adjust the latter longitudinally, itwill be necessary to adjust all the spindles the same amount and obtainthe proper circumferential position by adjusting the brush yoke.

In Figs. 5 and 6, I have shown a slight modification of my invention.Instead of mounting the brush forks on eccentric spindles, I here mountthe forks on adjustable eccentric bushings which surround the spindles.One of the supporting spindles is shown at 18 Surrounding each spindleis an eccentric split bushing 28. The bushing is provided at its lowerend with a flange 29, notched at 30, in order that a wrench may beapplied thereto for adjustment. It is seen that, by loosening the nut onthe clamping bolt 22 in the lugs of the split collar 21, the brush yokecan be adjusted at will. After the adjustment, the nut should again betightened to hold the fork in the proper position.

I aim in my claims to cover all modifications and changes which do notinvolve a departure from the spirit and scope of my invention.

that I claim as new and desire to secure by Letters Patent is 1. In adynamo-electric machine, a commutator, a brush yoke comprising a ringadjustably mounted on the frame of the machine, a radial spindle or rodin said ring, a brush fork supported on said spindle or rod, and meansoperative to permit the fork to be adjusted from one parallel plane toanother and to be adjusted within any one of such planes.

2. In a dynamo-electric machine, a commutator, a brush yoke adjustablymounted on the frame of the machine, a plurality of brush forks mountedon said yoke, and,

means operative to permit the forks to be adjusted relative to the yokelaterally and aXially of the commutator.

3. In a dynamo-electric machine, a commutator, a plurality of brushforks, a lurality of brushes carried by each fork, anc an eccentricsupporting member for each fork, said members being separatelyadjustable.

4. In a dynamo-electric machine, a commutator, a brush yoke, a pluralityof brush forks, and means for eccentrically mounting said brush forks onsaid brush yoke.

5. In a dynamo-electri machine, a brush yoke, a plurality of adjustableeccentric brush fork supports carried thereby, and a brush fork on eachof said supports.

6. In a dynamo-electric machine, a brush yoke, a plurality of adjustableradial members having eccentric portions, and a brush fork supported oneach of said eccentric portions.

7. In a dynamo-electric machine, a brush yoke com rising a ring, aplurality of eccentric spind es carried by said yoke, and a brush forkmounted on each of said spindles.

8. In a dynamo-electric machine, a brush yoke comprising a ring, aplurality of spindles mounted in said yoke, each of said spindles havingan eccentric portion, and a brush fork mounted on the eccentric portionof each of said spindles.

9. In a dynamo-electric machine, a brush yoke, a plurality of s indlesmounted therein, each of said spind es having an eccentric portion, abrush fork mounted on each eccentric spindle, and means for adjustingthe position of each of said spindles to adjust the position of eachbrush fork.

10. In a dynamo-electric machine, a brush yoke comprising an outer ring,an inner ring, and a plurality of arms oining said rings, a plurality ofspaced radial eccentric s indles mounted in said inner ring, a brush orkon each eccentric spindle, and means for separately adjusting each sindle.

In testimony whereof l affix my signature, in the presence of twowitnesses.

HOWARD I-I. RALSTON.

Witnesses:

FRED J. KINsEY, ARTHUR F. Kwrs.

